<template>
  <div class="upload-container">
    <el-button icon="el-icon-upload"
               size="mini"
               plain
               @click="dialogVisible = true"
               type="primary">上传图片
    </el-button>
    <el-dialog :visible.sync="dialogVisible"
               :append-to-body="true">
      <el-upload class="editor-slide-upload"
                 action="https://httpbin.org/post"
                 :multiple="true"
                 :file-list="fileList"
                 :show-file-list="true"
                 list-type="picture-card"
                 :on-remove="handleRemove"
                 :on-success="handleSuccess"
                 :before-upload="beforeUpload">
        <el-button size="small"
                   type="primary">点击上传</el-button>
      </el-upload>
      <el-button @click="dialogVisible = false">取 消</el-button>
      <el-button type="primary"
                 @click="handleSubmit">确 定</el-button>
    </el-dialog>
  </div>
</template>
<script>
export default {
  name: 'editorSlideUpload',
  data() {
    return {
      dialogVisible: false,
      listObj: {},
      fileList: [],
    }
  },
  methods: {
    checkAllSuccess() {
      return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
    },
    handleSubmit() {
      const arr = Object.keys(this.listObj).map(v => this.listObj[v])
      if (!this.checkAllSuccess()) {
        this.$message('请等待所有图片上传成功 或 出现了网络问题，请刷新页面重新上传！')
        return
      }
      this.$emit('successCBK', arr)
      this.listObj = {}
      this.fileList = []
      this.dialogVisible = false
    },
    handleSuccess(response, file) {
      const fileUid = file.uid
      const objKeyArr = Object.keys(this.listObj)
      for (let i = 0, len = objKeyArr.length; i < len; i++) {
        if (this.listObj[objKeyArr[i]].uid === fileUid) {
          this.listObj[objKeyArr[i]].url = response.files.file
          this.listObj[objKeyArr[i]].hasSuccess = true
          return
        }
      }
    },
    handleRemove(file) {
      const fileUid = file.uid
      const objKeyArr = Object.keys(this.listObj)
      for (let i = 0, len = objKeyArr.length; i < len; i++) {
        if (this.listObj[objKeyArr[i]].uid === fileUid) {
          delete this.listObj[objKeyArr[i]]
          return
        }
      }
    },
    beforeUpload(file) {
      const _self = this
      const _URL = window.URL || window.webkitURL
      const fileName = file.uid
      this.listObj[fileName] = {}
      return new Promise((resolve) => {
        const img = new Image()
        img.src = _URL.createObjectURL(file)
        img.onload = function () {
          _self.listObj[fileName] = {
            hasSuccess: false,
            uid: file.uid,
            width: this.width,
            height: this.height,
          }
        }
        resolve(true)
      })
    },
  },
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.editor-slide-upload {
  margin-bottom: 20px;
  ::v-deep .el-upload--picture-card {
    width: 100%;
  }
}
</style>
